Indeed, not a specific field for it. That’s why people use the body of the post (the part where one would write an essay if they did a text post) for it.
Here’s what I see when I tap the above image (with the alt text I added) in Voyager:
And here’s the MarkDown I wrote to accomplish that:

Here’s what I see when I tap the above image (with the alt text I added) in Voyager:

You can use the body for alt text, Sussy Susserton.
There is no client support for alt text field in photos.
Indeed, not a specific field for it. That’s why people use the body of the post (the part where one would write an essay if they did a text post) for it.
The body is not shown without clicking.
Easy accessibility is always a necessity.
It is on all clients I’ve used.
Here’s what I see when I tap the above image (with the alt text I added) in Voyager:
And here’s the MarkDown I wrote to accomplish that: